//Object impersonation method to implement js inheritance
function A(color) {
this.Acolor = color;
this.AshowColor = function() {
document.writeln("Acolor: " + this.Acolor);
}
}

function B(color, name) {
//Assign newMethod to A and call the constructor of A
this.newMethod = A;
this.newMethod(color);
//Then remove the reference to A so that he cannot be called later
delete this.newMethod;

this.Bname = name;
this.BshowName = function() {
document.writeln("Bname: " + this.Bname);
}
}

var objA = new A("red");
objA.AshowColor();
document.writeln("----------------");
var objB = new B("black", "demo");
objB.AshowColor();
objB.BshowName();
document.writeln("----------------");